Group 1 - The recent negotiations between China and the US in Madrid revealed a shift in strategy from the US, indicating a lack of confidence in handling China's responses to tariffs [1][3] - The US Treasury Secretary, Bessent, expressed a desire for the EU to take the lead in imposing tariffs on Chinese goods, particularly in the context of energy and technology sectors, highlighting the need for allied support [1][7] - China's assertive stance during negotiations, including a framework agreement on TikTok and investigations into Nvidia, showcased its negotiating power and willingness to counter US actions [3][5][9] Group 2 - The US's pre-negotiation tactics, such as adding Chinese entities to an export control list, were effectively countered by China, which initiated anti-dumping investigations on US imports of simulation chips [5][9] - The EU's mixed response to US pressure for joint tariffs on China reflects internal divisions, with some countries hesitant to align too closely with the US due to economic ties with China [7][8] - The evolving US-China economic relationship is characterized by a dual approach of seeking cooperation while simultaneously testing boundaries, indicating a complex and multifaceted dynamic [10]